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MC2: 10/03/12 Page
71
of
90
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
•
Ph: 800-526-0288
GF-115-H
OMM-0083_0B
Modulex MLX Series Gas Fired Boiler System
Operation and Maintenance Manual
Chap 10:
Troubleshooting
(Continued)
Airflow fault
during ignition
(AFDI)
switch
10. Defective blocked-air
inlet switch
11. Loose temperature
transmitter to VFD’s
analog input wire
connection
12. Loose temperature
sensor to temperature
transmitter wire
connection.
13. Defective temperature
transmitter
14. Defective temperature
sensor
15. Loose wire connection
between the 4-20 mA
signal from I/O box to
VFD analog input
16. Defective I/O box
17. Wrong 4-20 mA output
selection on the control
box
18. Defective air-fuel valve
potentiometer
19. Defective or missing
VFD’s logic stick
20. 16. Defective program
on the logic stick or
Defective VFD.
9.
Measure the Blower proof switch for continuity
with the combustion blower running. If there is an
erratic resistance reading or the resistance
reading is greater than zero ohms, replace the
switch.
10. Measure the blocked-air inlet switch for continuity
with the combustion blower running. If there is an
erratic resistance reading or the resistance
reading is greater than zero ohms, replace the
switch.
11. Check the actual inlet air temperature and
measure voltage at temperature transmitter and
VFD analog input. Verify that the voltage
conforms to Table 8-3 for the inlet air
temperature.
12. Refer to CORRECTIVE ACTION 7 and verify that
the resistance conforms to Table 8-3.
13. See CORRECTIVE ACTION 7.
14. See CORRECTIVE ACTION 8.
15. Measure amperage at the I/O box output and
VFD analog input, 4mA equates to 0% fire rate
and 20 mA equates to 100% fire rate
16. See CORRECTIVE ACTION 11.
17. Check C-More configuration menu, mA OUT –
Fire Rate should be selected
18. Check air fuel valve position at 0%, 50% and
100% fire rates, the position on the c-more
barograph should match the valve
19. Confirm that the logic stick is securely mounted
on the VFD
20. 16. Check the following VFD parameters: Max Hz
= 67, Min Hz = 0, parameter 59 & 60 should be
set to 2.
E23:
Air pressure
switch is always
active
1. Defective Switch or
Actuator
2. Incorrectly wired switch.
1. Check switch continuity, and either adjust or
replace the switch.
2. Ensure that the switch is correctly wired.
E24:
Blower speed is
incorrect for
ignition
1. Blower power connector
not properly attached to
blower.
2. Bad wire connection.
3. Blower is faulty
1. Check blower connector to ensure it is properly
seated.
2. Check electrical continuity of blower wires. Repair
or replace wires if necessary.
3. Try connecting blower to connector from other
blower known to function properly. Replace
blower if blower still does not function properly.
Table 10-1: Boiler Troubleshooting – PCB Terminal (Continued)